MFD: DA9052/53 MFD core module add SPI support v2

This patch add SPI support for DA9052/53 MFD core module.

This patch is functionally tested on Samsung SMDKV6410.

Signed-off-by: David Dajun Chen <dchen@diasemi.com>
Signed-off-by: Ashish Jangam <ashish.jangam@kpitcummins.com>
Acked-by: Samuel Ortiz <sameo@linux.intel.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>

3 files changed, 128 insertions, 0 deletions

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index baced42c8572..c8322eefc865 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -332,6 +332,18 @@ config PMIC_DA9052
         bool
         select MFD_CORE
 
+config MFD_DA9052_SPI
+        bool "Support Dialog Semiconductor DA9052/53 PMIC variants with SPI"
+        select REGMAP_SPI
+        select REGMAP_IRQ
+        select PMIC_DA9052
+        depends on SPI_MASTER=y
+        help
+          Support for the Dialog Semiconductor DA9052 PMIC
+          when controlled using SPI. This driver provides common support
+          for accessing the device, additional drivers must be enabled in
+          order to use the functionality of the device.
+
 config MFD_DA9052_I2C
         bool "Support Dialog Semiconductor DA9052/53 PMIC variants with I2C"
         select REGMAP_I2C
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 484f209f41e4..d5f574306c7f 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -69,6 +69,7 @@ obj-$(CONFIG_UCB1400_CORE)	+= ucb1400_core.o
 obj-$(CONFIG_PMIC_DA903X)       += da903x.o
 
 obj-$(CONFIG_PMIC_DA9052)       += da9052-core.o
+obj-$(CONFIG_MFD_DA9052_SPI)    += da9052-spi.o
 obj-$(CONFIG_MFD_DA9052_I2C)    += da9052-i2c.o
 
 max8925-objs                    := max8925-core.o max8925-i2c.o
diff --git a/drivers/mfd/da9052-spi.c b/drivers/mfd/da9052-spi.c
new file mode 100644
index 000000000000..cdbc7cad326f
--- /dev/null
+++ b/drivers/mfd/da9052-spi.c
@@ -0,0 +1,115 @@
+/*
+ * SPI access for Dialog DA9052 PMICs.
+ *
+ * Copyright(c) 2011 Dialog Semiconductor Ltd.
+ *
+ * Author: David Dajun Chen <dchen@diasemi.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ */
+
+#include <linux/device.h>
+#include <linux/module.h>
+#include <linux/input.h>
+#include <linux/mfd/core.h>
+#include <linux/spi/spi.h>
+#include <linux/err.h>
+
+#include <linux/mfd/da9052/da9052.h>
+
+static int da9052_spi_probe(struct spi_device *spi)
+{
+        int ret;
+        const struct spi_device_id *id = spi_get_device_id(spi);
+        struct da9052 *da9052 = kzalloc(sizeof(struct da9052), GFP_KERNEL);
+
+        if (!da9052)
+                return -ENOMEM;
+
+        spi->mode = SPI_MODE_0 | SPI_CPOL;
+        spi->bits_per_word = 8;
+        spi_setup(spi);
+
+        da9052->dev = &spi->dev;
+        da9052->chip_irq = spi->irq;
+
+        dev_set_drvdata(&spi->dev, da9052);
+
+        da9052_regmap_config.read_flag_mask = 1;
+        da9052_regmap_config.write_flag_mask = 0;
+
+        da9052->regmap = regmap_init_spi(spi, &da9052_regmap_config);
+        if (IS_ERR(da9052->regmap)) {
+                ret = PTR_ERR(da9052->regmap);
+                dev_err(&spi->dev, "Failed to allocate register map: %d\n",
+                        ret);
+                goto err;
+        }
+
+        ret = da9052_device_init(da9052, id->driver_data);
+        if (ret != 0)
+                goto err;
+
+        return 0;
+
+err:
+        kfree(da9052);
+        return ret;
+}
+
+static int da9052_spi_remove(struct spi_device *spi)
+{
+        struct da9052 *da9052 = dev_get_drvdata(&spi->dev);
+
+        da9052_device_exit(da9052);
+        kfree(da9052);
+
+        return 0;
+}
+
+static struct spi_device_id da9052_spi_id[] = {
+        {"da9052", DA9052},
+        {"da9053-aa", DA9053_AA},
+        {"da9053-ba", DA9053_BA},
+        {"da9053-bb", DA9053_BB},
+        {}
+};
+
+static struct spi_driver da9052_spi_driver = {
+        .probe = da9052_spi_probe,
+        .remove = __devexit_p(da9052_spi_remove),
+        .id_table = da9052_spi_id,
+        .driver = {
+                .name = "da9052",
+                .bus = &spi_bus_type,
+                .owner = THIS_MODULE,
+        },
+};
+
+static int __init da9052_spi_init(void)
+{
+        int ret;
+
+        ret = spi_register_driver(&da9052_spi_driver);
+        if (ret != 0) {
+                pr_err("Failed to register DA9052 SPI driver, %d\n", ret);
+                return ret;
+        }
+
+        return 0;
+}
+subsys_initcall(da9052_spi_init);
+
+static void __exit da9052_spi_exit(void)
+{
+        spi_unregister_driver(&da9052_spi_driver);
+}
+module_exit(da9052_spi_exit);
+
+MODULE_AUTHOR("David Dajun Chen <dchen@diasemi.com>");
+MODULE_DESCRIPTION("SPI driver for Dialog DA9052 PMIC");
+MODULE_LICENSE("GPL");